package com.atguigu.myjuc.demo;

import java.util.concurrent.CountDownLatch;

/**
 *CountDownLatch主要有两个方法，当一个或多个线程调用await方法时，这些线程会阻塞。
 *其它线程调用countDown方法会将计数器减1(调用countDown方法的线程不会阻塞)，
 *当计数器的值变为0时，因await方法阻塞的线程会被唤醒，继续执行。
 */
public class CountDownLatchDemo {
    public static void main(String[] args) throws InterruptedException {
        /*CountDownLatch downLatch = new CountDownLatch(6);
        for (int i = 1; i <= 6; i++) {
            new Thread(()->{
                System.out.println(Thread.currentThread().getName()+"\t"+"---离开教室");
                downLatch.countDown();
            },String.valueOf(i)).start();
        }
        downLatch.await();
        System.out.println(Thread.currentThread().getName()+"\t"+"值班同学关门走人");*/
        CountDownLatch downLatch = new CountDownLatch(6);
        for (int i = 1; i <= 6; i++) {
            new Thread(()->{
                System.out.println(Thread.currentThread().getName()+"\t"+"离开教室");
                downLatch.countDown();
            },String.valueOf(i)).start();
        }
        downLatch.await();
        System.out.println(Thread.currentThread().getName()+"\t"+"值班同学锁门离开");
    }
}
